openproject/app/assets/stylesheets/application.css.erb

/*
 * This is a manifest file that'll automatically include all the stylesheets available in this directory
 * and any sub-directories. You're free to add application-wide styles to this file and they'll appear at
 * the top of the compiled file, but it's generally better to create a new file per style scope.
 *
 *= require reset
 *= require jquery.ui.all
 *= require select2
 *= require select2_customizing
 *= require jstoolbar
 *= require context_menu-reset
 *= require context_menu
 *= require calendar
 *= require print
 *= require scm
 */